Basic info for this story perhaps? Emmeline, and probably Sturgis, will know Remus is a werewolf. Hopefully they will be able to cover for him if there is going to be a full moon during the trip.
MacNair, being the bas$%^& DE he is, will probably try to do harm to them if he sees them anywhere near his castle. I'm also betting he had something to do with Caradoc's disappearance.
Sorry if I was unclear. I assumed that most people who were in the first Order of the Phoenix (including Sturgis & Emmeline) would know that Remus was a werewolf. And of course they cover for him. Order members are like that.
Yes, it's safe to say that all readers, including all fanfic writers, loathe Walden Macnair. I've given him a whole family in this story (a mad old mother, a longsuffering but unpleasant wife, four obnoxious children and horrible grandchildren to follow shortly). And of course he is right in the middle of the Caradoc Dearborn business.